Spring MVC Bean Validation

Question

I have to implement validations for a web app that uses Spring MVC 3. The problem is that the bean class has methods like getProperty("name") and setProperty("name",valueObj). The validations have to be done on the data that is returned by passing different values to getProperty("name") , for eg: getProperty("age") should be greater than 16 and getProperty("state") should be required.

I would like to know if there is any support for validation this kind of Bean and if not, what can be the work around.

Thanks, Atif

IMHO that class is just not a bean.

SJuan76
– SJuan76

2012-04-23 21:41:08 +00:00
Commented Apr 23, 2012 at 21:41 — SJuan76
– SJuan76, Commented Apr 23, 2012 at 21:41

Bozho · Accepted Answer · 2012-04-23 22:00:00Z

4

I don't think so. Bean validation is performed on javabeans, i.e. class fields with getters and setters. Even if you can register a custom validator, and make validation work, binding won't work. You would need to also register a custom binder that populates your object. It becomes rather complicated. So stick to the javabeans convention.

edited Apr 23, 2012 at 22:00

answered Apr 23, 2012 at 21:48

Bozho

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Beau Grantham · Accepted Answer · 2012-04-23 21:51:01Z

2

It sounds like you want to a custom validation class which implements org.springframework.validation.Validator.

@Component
public class MyValidator implements Validator {

    @Override
    public boolean supports(Class<?> clazz) {
        return MyBean.class.isAssignableFrom(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {
        MyBean myBean = (MyBean) target;

        if (StringUtils.isBlank(myBean.getProperty("state"))) {
            errors.rejectValue("state", "blank");
        }
    }

}

In your controller you would do manual validaton like follows:

@Autowired
private MyValidator myValidator;

@RequestMapping(value = "save", method = RequestMethod.POST)
public String save(@ModelAttribute("myBean") MyBean myBean, BindingResult result) {

    myValidator.validate(myBean, result);
    if (result.hasErrors()) {
        ...
    }

    ...

}

answered Apr 23, 2012 at 21:51

Beau Grantham

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3 Comments

Bozho Over a year ago

+1, that will work. But his bean won't be bound properly, which is before validation. So a custom binding will be needed as well. ;)

Beau Grantham Over a year ago

@Bozho Very good point, another argument for true JavaBeans :)

Atif Sultanuddin Over a year ago

In Struts 1.x there was called as DynaBean where just had to define the bean properties in an xml without the overhead of creating each class. Does Spring provide any such method of dynamically or by configuration, creating Bean classes? Like can we define the bean and the validations in the XML?

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